Packages require 24 hours to complete processing after entering the sorting station. The processing time normally extends to 24 hours after the package reaches the sorting center but high shipment volume or logistical issues can cause delays.
JHB Sorting Centre Shopee Express: Detailed Address

You must contact Shopee Express Customer Service at +603-2777-9222 along with checking the Shopee app when your package stays in transit longer than expected delivery windows:
– You should wait from 24 to 48 hours because the processing stage might still be active.
– You can reach Shopee Express Customer Service through either the Shopee application or by dialing +603-2777-9222 for additional support.
Shopee Express does not provide details about their working hours yet their majority of sorting centers operate continuously to manage large parcel volumes.